Source Code : Handling Focus Changes

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Handling Focus Changes

   

import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

import javax.swing.JFrame;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] argv) throws Exception {
    JTextField component = new JTextField();
    component.addFocusListener(new MyFocusListener());
    JFrame f = new JFrame();

    f.add(component);
    f.setSize(300, 300);
    f.setVisible(true);

  }
}

class MyFocusListener extends FocusAdapter {
  public void focusGained(FocusEvent evt) {
    System.out.println("component gained the focus");
  }

  public void focusLost(FocusEvent evt) {
    System.out.println("component lost the focus");
  }
}

   
    
    
  

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